How to use

deleteDirIfExists

method

in

alluxio.util.UnderFileSystemUtils

/**
 * Sets up corresponding directories for tests.
 */
protected void setupTest() throws IOException {
 UnderFileSystem ufs = UnderFileSystem.Factory.createForRoot(ServerConfiguration.global());
 String underfsAddress = ServerConfiguration.get(PropertyKey.MASTER_MOUNT_TABLE_ROOT_UFS);
 // Deletes the ufs dir for this test from to avoid permission problems
 UnderFileSystemUtils.deleteDirIfExists(ufs, underfsAddress);
 // Creates ufs dir. This must be called before starting UFS with UnderFileSystemCluster.create()
 UnderFileSystemUtils.mkdirIfNotExists(ufs, underfsAddress);
 // Creates storage dirs for worker
 int numLevel = ServerConfiguration.getInt(PropertyKey.WORKER_TIERED_STORE_LEVELS);
 for (int level = 0; level < numLevel; level++) {
  PropertyKey tierLevelDirPath =
    PropertyKey.Template.WORKER_TIERED_STORE_LEVEL_DIRS_PATH.format(level);
  String[] dirPaths = ServerConfiguration.get(tierLevelDirPath).split(",");
  for (String dirPath : dirPaths) {
   FileUtils.createDir(dirPath);
  }
 }
 // Formats the journal
 Format.format(Format.Mode.MASTER, ServerConfiguration.global());
}

/**
 * Sets up corresponding directories for tests.
 */
protected void setupTest() throws IOException {
 UnderFileSystem ufs = UnderFileSystem.Factory.createForRoot();
 String underfsAddress = Configuration.get(PropertyKey.MASTER_MOUNT_TABLE_ROOT_UFS);
 // Deletes the ufs dir for this test from to avoid permission problems
 UnderFileSystemUtils.deleteDirIfExists(ufs, underfsAddress);
 // Creates ufs dir. This must be called before starting UFS with UnderFileSystemCluster.get().
 UnderFileSystemUtils.mkdirIfNotExists(ufs, underfsAddress);
 // Creates storage dirs for worker
 int numLevel = Configuration.getInt(PropertyKey.WORKER_TIERED_STORE_LEVELS);
 for (int level = 0; level < numLevel; level++) {
  PropertyKey tierLevelDirPath =
    PropertyKey.Template.WORKER_TIERED_STORE_LEVEL_DIRS_PATH.format(level);
  String[] dirPaths = Configuration.get(tierLevelDirPath).split(",");
  for (String dirPath : dirPaths) {
   FileUtils.createDir(dirPath);
  }
 }
 // Formats the journal
 Format.format(Format.Mode.MASTER);
}